JP3274112B2 - Post type jib crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a post type jib crane, and more particularly, to a post type jib crane to which a chain block or the like is attached.

[0002]

2. Description of the Related Art A post-type jib crane is provided with a jib to which a chain block and the like are attached, a load is suspended, a column for supporting the jib, and a post for rotatably supporting the column. The jib is pivoted to a predetermined position for suspending the load by rotating the column, and the load is lifted and suspended by a chain block or the like attached to the jib.

In such a post-type jib crane, as a drive system for rotating a column, for example, a gear system, a worm gear system, a roller chain system, a roller wheel system and the like are known as an electric swing drive system. I have.

In the gear system, for example, a flat gear is provided on the entire outer periphery of one of a post and a column, and a motor, a speed reducer, and a pinion gear are provided on the other, so that the flat gear and the pinion gear mesh with each other. By driving the motor, the pinion gear is rotated via a speed reducer with respect to the spur gear,
Thereby, the column is rotated with respect to the post.

In the worm gear system, for example,
A worm wheel is provided on the entire outer periphery of one of the post and the column, and a motor, a speed reducer, and a worm are provided on the other, and the worm wheel and the worm are configured to mesh with each other, and the motor is driven. Causes the worm to rotate with respect to the worm wheel via the speed reducer, thereby rotating the column with respect to the post.

In the roller chain system, for example, a fixed sprocket is provided on the entire outer periphery of one of a post and a column, and a motor, a speed reducer, and a driving sprocket are provided on the other. A roller chain is configured to be bridged between the drive sprocket and the drive sprocket, and by driving the motor, the drive sprocket is moved through the reduction gear to the fixed sprocket through the roller chain. Rotation, which causes the column to rotate relative to the post.

In the roller wheel system, the outer periphery of a support roller for rotatably supporting a post is formed of hard rubber, and a gear is provided on the support roller. The gear is connected to a motor via a pinion gear and a speed reducer. By rotating the column, the column is rotated with respect to the post.

[0008]

SUMMARY OF THE INVENTION However, as described above,
In the gear system, worm gear system and roller chain system, a flat gear in the case of a gear system, a worm wheel in the case of a worm gear system, and a sprocket in the case of a roller chain system in the entire outer periphery of one of the post and the column. Must be provided. However, posts and columns are usually very large in diameter, and providing large diameter spur gears, worm wheels, or sprockets around the entire circumference requires a lot of processing time and equipment costs. It has the disadvantage of becoming expensive. Also, such large-diameter spur gears, worm wheels, or sprockets are quite heavy, so that the weight of the device becomes heavy, which reduces the workability at the time of installation and further reduces the durability. It has the defect of.

In the roller wheel system, it is not necessary to provide a large-diameter spur gear, worm wheel or sprocket, but on the other hand, the outer periphery of the support roller is formed of hard rubber, or a gear is mounted on the support roller. For example, there is a problem that the number of parts increases and the configuration becomes complicated, such as the necessity of providing them, and the cost of the apparatus also increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to enable a column to be rotated with respect to a post with a simple configuration, thereby reducing cost and weight. An object of the present invention is to provide a post-type jib crane that can be designed.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention according to claim 1 is directed to a post type jib crane having a column for supporting a jib and a post on which the column is rotatably supported. A driving source and a pulley connected to the driving source are provided on one of the column and the post, and the outer periphery of the pulley and the other column or the post on which the pulley is not provided. Between the endless belt and the outer periphery of the other column or post where the pulley is not provided. It is characterized in that substantially non-slip resistance is applied when the relative rotation is made.

In such a configuration, when the driving source is driven, the pulley connected to the driving source rotates.
Since the endless belt is provided with a resistance that does not substantially slip between the outer periphery of the other column or post where the pulley is not provided, the pulley rotates without moving the endless belt, thereby The column rotates relative to.

[0013]

FIG. 1 is a schematic side view showing an embodiment of a post type jib crane according to the present invention, FIG. 2 is a side view of a main part of the post type jib crane shown in FIG. 1, and FIG.
FIG. 3 is a top view of a main part shown in FIG. In FIG. 1, a post type jib crane 1 includes a post 2 installed at a predetermined installation location, and a column 3 rotatably supported by the post 2.
And a traversing rail 4 as a jib provided to extend from the column 3 in the horizontal direction.

The post 2 has a cylindrical shape extending in the longitudinal direction, and is provided so as to stand up from the installation location.
At its lower end, a disk-shaped base plate 5 for supporting the post 2 is provided. Although not shown in the drawing, the base plate 5 is fixed to the installation place by anchor bolts or the like. Further, a plurality of reinforcing plates 6 joined to the lower outer peripheral surface of the post 2 are erected on the base plate 5, whereby the post 2 is securely supported. On the other hand, a bearing (not shown in FIG. 1) for rotatably supporting the column 3 when the column 3 described below is fitted is provided on the upper portion of the post 2.

The column 3 has a cylindrical shape having a slightly larger diameter than the post 2 and extending in the longitudinal direction, and a lower portion thereof is fitted to an outer periphery of an upper portion of the post 2.
The column 3 is rotatably supported with respect to the post 2. On the lower side, the rotation of the column 3 with respect to the post 2 is smoothed, and the weight of the traversing rail 4 described below makes the column 3
There is provided a supporting roller 7 for preventing the tilting of the roller. That is, as shown in FIG. 2, a rectangular opening is formed in the lower part of the column 3 along the horizontal direction, and the opening is sandwiched from above and below.
A pair of mounting brackets 8 are provided to face each other, and the support roller 7 is mounted by its roller shaft 9 being rotatably supported by the mounting bracket 8. The support roller 7 rotates and abuts on the outer periphery of the post 2 while being supported by the column 3 via the mounting bracket 8, so that the rotation of the column 3 with respect to the post 2 can be performed smoothly, and the traversing rail 4 can be used. Prevents the column 3 from tilting with respect to the post 2 due to the weight of the column 2.

The traversing rail 4 has a substantially H-shaped cross section extending in the longitudinal direction.
Are provided so as to extend outward in the radial direction.
The traversing rail 4 is provided at its rear side with a reinforcing plate 10 which is joined to the upper outer peripheral surface of the column 3, whereby the reinforcing plate 10 is securely fixed to the column 3. In addition, the traversing rail 4 includes
A trolley 11 that moves in the longitudinal direction is provided, and an electric chain block 12 is suspended from the trolley 11. A stopper member 13 for restricting the movement of the trolley 11 is provided on each of the front side and the rear side of the traversing rail 4.

In the post-type jib crane 1 of the present embodiment thus configured, a drive unit 14 for rotating the column 3 with respect to the post 2 is provided on the lower side of the column 3. And a toothed pulley 1 described later provided in the drive unit 14.
A toothed belt 15 as an endless belt is stretched between 8 and the outer periphery of the upper part of the post 2.

In FIG. 2 and FIG.
The column 3 includes a motor 17 with a reduction gear as a driving source, a toothed pulley 18 connected to the motor 17 with a reduction gear, and a motor support member 19 for supporting the motor 17 with a reduction gear. The toothed pulley 18 is disposed on the lower side of the post 2 in a radially outward direction, and is disposed so as to face the outer periphery of the upper portion of the post 2 in the horizontal direction.

A motor support member 19 is provided radially outward of the column 3 with a support plate 20 having an L-shaped cross section, which is attached to the column 3 along the horizontal direction, and stands upright from both ends of the support plate 20. And a pair of reinforcing plates 21 joined to the outer peripheral surface of the column 3 and a receiving plate 22 having an L-shaped cross section for receiving the motor 17 with a reduction gear.

When the bent rear end of the support plate 20 faces downward, the front end of the support plate 20 is joined to the lower end of the column 3 along the horizontal direction. 3, through which the motor 17 with a speed reducer can be inserted, and an opening 23 having a slight gap in the front-rear direction when the motor 17 with a speed reducer is inserted is formed. In addition, the receiving plate 22
It is formed to have a width substantially equal to that of the support plate 20 and has a hole through which the drive shaft 25 of the motor 17 with a speed reducer can be inserted. Are attached to the lower surface of the motor support plate 20 via a plurality of bolts 24 and nuts 29. In addition. In this mounting, four holes for inserting the bolts 24 are formed at both ends in the width direction of the support plate 20, and at positions opposed to the four holes in the receiving plate 22, respectively, in the front-rear direction. The receiving plate 22 is attached to the support plate 20 so as to be adjustable in the front-rear direction by the long hole 30.

More specifically, when the upper surface of the receiving plate 22 faces the lower surface of the supporting plate 20, the supporting plate 20
The bent rear end of the support plate 20 and the bent rear end of the receiving plate 22 are arranged to face each other, but the bent rear end of the support plate 20 can be inserted with the position adjusting screw 26. A hole 27 is formed, and a screw groove 28 is formed at a position facing the hole 27 at a bent rear end portion of the receiving plate 22.
In a state in which the support plate 20 is inserted into the hole 27, the position adjusting screw 26 is screwed into or out of the screw groove 28 to adjust the receiving plate 22 in the front-rear direction with respect to the support plate 20. The receiving plate 22 is fixed to the support plate 20 by the bolts 24 and the nuts 29 in a state where the tensioned state of the toothed belt 15 is adjusted to be suitable. A nut 35 is fastened to the tip of the position adjusting screw 26. The support plate 20
Cover members 3 extending downward on both sides in the width direction of
6 are attached respectively.

The motor 17 with a speed reducer is supported by the receiving plate 22 with the drive shaft 25 inserted through the hole of the receiving plate 22 downward. , A toothed pulley 18 is attached. In this state, the toothed pulley 18
Is opposed to the outer periphery of the upper part of the post 2 in the horizontal direction.

A toothed belt 15 is stretched between the toothed pulley 18 and the outer peripheral surface of the post 2 facing the toothed pulley 18 in the horizontal direction. The toothed belt 15 is made of an elastic material such as rubber,
As shown in FIG. 5, the side of the post 2 which is in contact with the outer peripheral surface is formed in an uneven shape, and is in contact with substantially half of the outer peripheral surface of the post 2. When the column 3 rotates relative to the post 2, the toothed belt 15
Is prevented from slipping against the outer peripheral surface of the vehicle.

In the post type jib crane 1 constructed as described above, in order to rotate the column 3 with respect to the post 2 and turn the traversing rail 4 to an arbitrary position where a load is hung, a motor 17 with a reduction gear is required. , The toothed pulley 18 may be rotated via the drive shaft 25. Then, the movement of the toothed belt 15 in the circumferential direction at the post 2, that is, in the bridging direction of the toothed belt 15, is substantially restricted by the frictional resistance generated between the toothed belt 15 and the outer peripheral surface of the post 2. ,
The toothed pulley 18 is moved without the toothed belt 15 moving.
Is rotated, the column 3 on which the toothed pulley 18 is supported is rotated relatively to the post 2, whereby the traversing rail 4 is swung. When the column 3 is rotated relative to the post 2, the movement of the post 2 in the circumferential direction is substantially restricted by the frictional resistance generated between the toothed belt 15 and the outer peripheral surface of the post 2. However, for example, when the swinging motion of the traversing rail 4 is stopped, when the load swings in the horizontal direction, the toothed belt 15 is absorbed so as to absorb the swing.
May be provided with a frictional resistance so as to slide against the outer peripheral surface of the post 2.

Then, at any turned position,
The operation of lifting or suspending the load may be performed by moving the trolley 11 in the longitudinal direction of the traversing rail 4 and moving the chain block 12 to a predetermined position where the load is suspended.

In such a post type jib crane 1,
The column 3 can be relatively rotated with respect to the post 2 only by bridging the toothed belt 15 between the toothed pulley 18 and the outer peripheral surface of the post 2. There is no need to provide a large-diameter spur gear, worm wheel, sprocket, or the like over the entire outer peripheral surface, and there is no need to provide a gear for the support roller 7, so that it can be realized with a simple configuration with a small number of parts. Therefore, the cost of the device can be reduced, the weight can be reduced, and the workability during installation and the durability can be improved.

In the present embodiment, the drive unit 14 is provided on the column 3 so that the toothed belt 15 is bridged between the toothed pulley 18 and the outer peripheral surface of the post 2. That is, the drive unit 14 is attached to the post 2.
And the toothed belt 15 may be bridged between the toothed pulley 18 and the outer peripheral surface of the column 3.

Further, in this embodiment, the toothed belt 15 is bridged between the toothed pulley 18 and the outer peripheral surface of the post 2 by using the toothed pulley 18 and the toothed belt 15. However, any endless belt can be used as long as it does not slip between the outer peripheral surface of the post 2 and, for example, a flat belt and a flat pulley may be used. A V belt and a V pulley may be used. Further, the present invention is not limited to a structure that does not slip due to frictional resistance. For example, at least one position of the endless belt may be fixed to at least one position of the post 2. In addition, the endless belt may be configured such that an endless (loop-shaped) belt is previously bridged between the toothed pulley 18 and the outer peripheral surface of the post 2.
After bridging between the toothed pulley 18 and the outer peripheral surface of the post 2, both ends thereof may be joined or fixed.

Further, in the present embodiment, the chain block 1 is provided via the trolley 12 using the traversing rail 4 as a jib.
Although the jib is supported, any type of jib may be used depending on its purpose and application. For example, a jib having a pulley or the like attached to the tip of the arm may be used.

[0030]

As described above, according to the first aspect of the present invention, the endless belt is simply bridged between the pulley and the outer periphery of the other column or post not provided with the pulley. Since the column can be rotated relative to the post, there is no need to provide large diameter spur gears, worm wheels or sprockets, and there is no need to provide gears for the support rollers, so the number of parts is small. It can be realized by a simple configuration. Therefore, the cost of the device can be reduced, the weight can be reduced, and the workability during installation and the durability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment of a post type jib crane according to the present invention.

FIG. 2 is a side view of a main part of the post type jib crane shown in FIG.

FIG. 3 is a top view of a main part shown in FIG. 2;

FIG. 4 is an explanatory diagram for explaining a toothed belt bridged between a post and a toothed pulley.

[Explanation of symbols]

 Reference Signs List 1 post type jib crane 2 post 3 column 4 traversing rail 15 toothed belt 17 motor with reducer 18 toothed pulley

Claims (1)

(57) [Claims] 1. A post-type jib crane having a column for supporting a jib and a post on which the column is rotatably supported, wherein one of the column and the post has a drive source and a drive source. A pulley to be connected is provided, and an endless belt is bridged between the pulley and the outer circumference of the other column or the post where the pulley is not provided. When the column is relatively rotated with respect to the post, resistance that does not substantially slip is provided between the other column or the outer periphery of the post where the pulley is not provided. , Post type jib crane.